Providing critical care to cancer patients requires a high degree of practical multidisciplinary teamwork between intensivists and cancer specialists. Intensivists should have a solid basic knowledge of malignant diseases as well as of the typical complications of the underlying illness and its therapies. Hemato-oncologists should evaluate the transfer of these patients to the intensive care unit early in the course of emerging organ dysfunctions. Both parties should have a realistic impression of the short-term intensive care and long-term oncologic options and perspectives of the respective patient. Good cooperation between intensivists and cancer specialists is the basis for meaningful decisions on admission, planning of individual therapeutic aims, successful patient management, and tailored therapy, with a smooth transition into a palliative care setting whenever appropriate.